I'll probably gonna get flamed for this... But pls try this method before getting nasty. Avoid anti-freeze if u can. If u can't, then don't use it too frequently. It causes corrosion to metals no matter what the instructions claim. If u don't believe, just try this experiment... Leave a scrap piece of aluminium in it for a month and see. Of course, no one would be leaving their engines in it for that long, but if there is a less harmful alternative to cleaning our precious engines, wouldn't u want to try it?

I clean my internals (glow engines) with glow fuel and use a steaming machine to steam-off the baked on stuff on the outside. Its more effective than engine degreasers, anti-freeze, thinners etc and less harmful since the maximum temperature that super-heated steam reaches in these machines is 130 - 140deg centigrade (not sure what this works out to in Farenheit). I've even used this method on full-sized engines and they always gleam with that brand new look. It may be expensive to invest in one of these machines so just try borrowing one from a friend. They're quite cheap in Australia and u can usually get them for A$100+ on sale. The other method to getting one is to convince the Missus that it'll cut the effort in household cleaning by half...